GT40s.com - View Single Post

Kalun D · 11-19-04, 03:04 AM

Well the Pro Magnum rockers are installed and the tips still won't center, except it's only on some of the valves. AFR says to put some ARP studs in it, this helps because their longer but the stud holes are still a little off on some of the valves. This confirms what the machinest says that ARP uses some economy hardware. The ARP studs definitely improve the centering buts it's still not exact.

I guess I didn't know what to expect with mass produced A.M. heads. The tips are also off center in the front to rear direction also. Measuring the distance between studs shows a .025" max difference. A straightedge from front to back shows a .015" difference. The threaded stud holes are inserted with heli-coils which I've never really liked, and think this may be contributing to innacuracy.

The cam is also showing off time by up to 6 deg between different valves. Need to do more measuring and researching and may post to "engines and drivetrains" once I have it all figured out.

11-19-04, 03:04 AM	#13 (permalink)
Kalun D Kalun_D 5 Tenths Join Date: Dec 2003 Location: Seattle GT40: KVA body, scrat Posts: 556 Rep Power: 10	Re: My Jesel Saga Well the Pro Magnum rockers are installed and the tips still won't center, except it's only on some of the valves. AFR says to put some ARP studs in it, this helps because their longer but the stud holes are still a little off on some of the valves. This confirms what the machinest says that ARP uses some economy hardware. The ARP studs definitely improve the centering buts it's still not exact. I guess I didn't know what to expect with mass produced A.M. heads. The tips are also off center in the front to rear direction also. Measuring the distance between studs shows a .025" max difference. A straightedge from front to back shows a .015" difference. The threaded stud holes are inserted with heli-coils which I've never really liked, and think this may be contributing to innacuracy. The cam is also showing off time by up to 6 deg between different valves. Need to do more measuring and researching and may post to "engines and drivetrains" once I have it all figured out.